Possible overheating issue/fusebox area fault?

Chunky2778 · 21st October 2019, 17:53

Hi all, I've an 04 plate CDTi ZT that has basically not had the best of lives but should scrub up half-decent over time.

It's been sat for 3 or 4 months, driven 60 miles from where I bought it, started and ran every week, MoT'd and has been on the road for about 3 weeks.

Today I was pottering about trying to find my RCL fault and pulled each fuse to inspect. Must have put one fuse back in wrong slot as when I went out later the washers didn't work.

However first I pulled the bonnet and topped up the water and noticed that he'd spat some coolant. Nothing major, but enough to smell and sit in the ridges of the coolant expansion tank.

I've already done the thermostat mod months ago and it sits right on 9 o'clock, needle never moves once there. No signs of overheating either, and the level was fine.

Initial thoughts were the fan speed resistor (aircon doesn't work) but I read a few comments on here that said it's very rare for a diesel to get that hot to need the fan. The journey was nothing out of the ordinary, a little fast A road and some milling about some small B roads.

Is it possible something else runs off the fuse for the washer pump? Only other thing I've noticed is the coolant cap is ridiculously tight.

Do these suffer from head gaskets? Anyone ever had a cap go?

Also could someone remind of the procedure for getting the odometer to go into diagnostic mode so I can verify the gauge isn't faulty and read what the ECU is seeing temp-wise please?

My fear is there were a few wires with blue insulation tape around them near the fusebox and I've disturbed something.........

21st October 2019, 17:53	#1
Chunky2778 Avid contributor MG ZT Join Date: Mar 2019 Location: Plymouth Posts: 109 Thanks: 5 Thanked 9 Times in 8 Posts	Possible overheating issue/fusebox area fault? Hi all, I've an 04 plate CDTi ZT that has basically not had the best of lives but should scrub up half-decent over time. It's been sat for 3 or 4 months, driven 60 miles from where I bought it, started and ran every week, MoT'd and has been on the road for about 3 weeks. Today I was pottering about trying to find my RCL fault and pulled each fuse to inspect. Must have put one fuse back in wrong slot as when I went out later the washers didn't work. However first I pulled the bonnet and topped up the water and noticed that he'd spat some coolant. Nothing major, but enough to smell and sit in the ridges of the coolant expansion tank. I've already done the thermostat mod months ago and it sits right on 9 o'clock, needle never moves once there. No signs of overheating either, and the level was fine. Initial thoughts were the fan speed resistor (aircon doesn't work) but I read a few comments on here that said it's very rare for a diesel to get that hot to need the fan. The journey was nothing out of the ordinary, a little fast A road and some milling about some small B roads. Is it possible something else runs off the fuse for the washer pump? Only other thing I've noticed is the coolant cap is ridiculously tight. Do these suffer from head gaskets? Anyone ever had a cap go? Also could someone remind of the procedure for getting the odometer to go into diagnostic mode so I can verify the gauge isn't faulty and read what the ECU is seeing temp-wise please? My fear is there were a few wires with blue insulation tape around them near the fusebox and I've disturbed something.........